(20 U.S.C. 6301 et. seq.), as amended by this Act, from programs. authorized under the Elementary and Secondary Education Act. of 1965 (20 U.S.C. 6301 et seq.), as in effect on the day before. the date of enactment of this Act.
The efficacy of a vaccine is different from its effectiveness. It is dependent on several factors such as: 1  adherence to vaccine schedules. 2  the disease â some diseases have vaccines against them that perform better than for other diseases. 3  the strain of vaccine â some vaccine strains are more effective than others.
The childhood vaccine (PCV) protects against 13 strains of the pneumococcal bacterium, while the adult vaccine (PPV) protects against 23 strains. The pneumococcal vaccine is thought to be around 50-70% effective at preventing pneumococcal disease.